Single-stage three-phase boost power factor correction circuit for AC–DC converter

This article presents a single-stage three-phase power factor correction (PFC) circuit for AC-to-DC converter using a single-switch boost regulator, leading to improve the input power factor (PF), reducing the input current harmonics and decreasing the number of required active switches. A novel PFC control strategy which is characterised as a simple and low-cost control circuit was adopted, for achieving a good dynamic performance, unity input PF, and minimising the harmonic contents of the input current, at which it can be applied to low/medium power converters. A detailed analytical, simulation and experimental studies were therefore conducted. The effectiveness of the proposed controller algorithm is validated by the simulation results, which were carried out using MATLAB/SIMULINK environment. The proposed system is built and tested in the laboratory using DSP-DS1104 digital control board for an inductive load. The results revealed that the total harmonic distortion in the supply current was very low. Finally, a good agreement between simulation and experimental results was achieved.     

一款隔离的低成本的直流电流检测电路

文中提出了一款简单的直流电流采样、隔离电路,利用抗浪涌电路（热插拔电路）MOSFET的导通电阻作为采样电阻,经过单电源运放组成的信号放大电路,和555时钟芯片组成的幅-频转换器转变为脉冲信号,通过光耦隔离,送入后级的监控电路。实验验证了其可行性。     

激光电源充电技术

介绍了几种常见的激光充电电源方案，分析了其电路的工作原理，优缺点及应用场合，并着重分析了一种串联谐振全桥变换充电电源。该充电电源应用软开关技术，具有高效率、高充电精度等特点，非常适用于高压大功率激光电源中。     

Low-Power Area-Efficient Pipelined A/D Converter Design Using a Single-Ended Amplifier

This paper presents a new scheme of a low-power area-efficient pipelined A/D converter using a single-ended amplifier. The proposed multiply-by-two single-ended amplifier using switched capacitor circuits has smaller DC bias current compared to the conventional fully-differential scheme, and has a small capacitor mismatch sensitivity, allowing us to use a smaller capacitance. The simple high-gain dynamic-biased regulated cascode amplifier also has an excellent switching response. These properties lead to the low-power area-efficient design of high-speed A/D converters. The estimated power dissipation of the 10-b pipelined A/D converter is less than 12 mW at 20 MSample/s.     

ZVS-PWM正激变换器有源箝位磁复位技术的研究

在有源箝位ZVS-PWM正激变换器中,变压器的磁复位技术是其中最关键的一项技术。文章结合仿真和初步的试验结果对有源箝位ZVS-PWM正激变换器的整个工作过程中的能量流动进行分析,总结出使变压器有效磁复位以及开关管ZVS开通的方法。     

并联冗余DC-DC模块蓄电池充电均流方法

并联冗余是应用于风光互补独立供电系统的DC-DC变换器满足高可靠性要求的关键,而均流技术是并联冗余的关键,现有的均流方法无法同时满足并联冗余和蓄电池充电要求。本文在分析并联DC-DC模块蓄电池充电特性的基础上提出了一种实现并联DC-DC变换器瞬时均流的新控制方法。该方法基于平均电流法原理,通过单片机A/D口检测蓄电池充电电压和各并联DC-DC模块充电电流,判断蓄电池状态,自适应调整各模块PWM信号占空比实现均流和充电控制。文中根据理论模型进行了仿真,并构建实际系统进行了实验,仿真和实验结果表明,此方法能够同时满足DC-DC变换器并联冗余和蓄电池三段式充电的要求,验证了方法的有效性。     

基于MCS-51单片机的数控恒流源设计

为了克服传统恒流源无法实现精确步进的缺点,设计了基于MCS-51单片机的数控恒流源。系统由压控恒流单元、数控单元、稳压电源等几部分组成。分析了工作原理,并给出了硬件和软件的具体实现方法。测量结果表明,该设计具有控制精度高、纹波电流小、工作稳定等优点,有很强的实用性,对相关产品的研制有重要的指导意义。     

航天器DC/DC变换器热分析研究

为了解决航天器DC/DC变换器的热可靠性问题,利用有限元分析软件ANSYS对实际的航天器DC/DC变换器进行热仿真分析,得到了其内部的温度分布特性。并对其进行了红外成像测试实验,通过红外成像测试结果与仿真分析结果对比分析,验证了热仿真的准确性。使用有限元分析方法为航天器DC/DC变换器合理热设计提供了依据,也为同类电子设备的热设计提供了一种思路。     

变频调速在空调系统中的应用

针对人们对生活环境的要求和节能技术的推进,介绍变频空调相对于定频空调节能舒适的优势,通过对变频调速的基本原理、压缩机的定子电压与频率关系的论述,详细分析将变频器引入空调系统的工作原理,结果表明变频空调已进入快速发展期,在我国变频空调将成为空调发展的必然趋势。     

A single-input dual-output 13.56 MHz CMOS AC–DC converter with comparator-driven rectifiers for implantable devices

A highly efficient single-input, dual-output AC–DC converter for wireless power transfer in implantable devices is implemented using the 0.18-µm CMOS process. The proposed AC–DC converter, consisting of three rectifiers with cross-coupled NMOS transistors and comparator-driven PMOS transistors, achieves up to 79.5% power conversion efficiency at 13.56 MHz operation frequency in order to provide dual outputs of 1.2 V and 2.2 V DC voltages along with 6.2 mA and 22.6 mA of current, respectively, to the implant device from a single RF input. The designed IC consumes a core die area of 0.18 mm².